/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.naming.factory;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Hashtable;
import java.util.Properties;
import java.util.Enumeration;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimePart;
import javax.mail.internet.MimePartDataSource;
import javax.naming.Name;
import javax.naming.Context;
import javax.naming.Reference;
import javax.naming.RefAddr;
import javax.naming.spi.ObjectFactory;

/**
 * Factory class that creates a JNDI named javamail MimePartDataSource object
 * which can be used for sending email using SMTP.
 * <p>
 * Can be configured in the DefaultContext or Context scope of your server.xml
 * configuration file.
 * <p>
 * Example:
 * <p>
 * 
 * <pre>
 * &lt;Resource name=&quot;mail/send&quot; auth=&quot;CONTAINER&quot;
 *           type=&quot;javax.mail.internet.MimePartDataSource&quot;/&gt;
 * &lt;ResourceParams name=&quot;mail/send&quot;&gt;
 *   &lt;parameter&gt;&lt;name&gt;factory&lt;/name&gt;
 *     &lt;value&gt;org.apache.naming.factory.SendMailFactory&lt;/value&gt;
 *   &lt;/parameter&gt;
 *   &lt;parameter&gt;&lt;name&gt;mail.smtp.host&lt;/name&gt;
 *     &lt;value&gt;your.smtp.host&lt;/value&gt;
 *   &lt;/parameter&gt;
 *   &lt;parameter&gt;&lt;name&gt;mail.smtp.user&lt;/name&gt;
 *     &lt;value&gt;someuser&lt;/value&gt;
 *   &lt;/parameter&gt;
 *   &lt;parameter&gt;&lt;name&gt;mail.from&lt;/name&gt;
 *     &lt;value&gt;someuser@some.host&lt;/value&gt;
 *   &lt;/parameter&gt;
 *   &lt;parameter&gt;&lt;name&gt;mail.smtp.sendpartial&lt;/name&gt;
 *     &lt;value&gt;true&lt;/value&gt;
 *   &lt;/parameter&gt;
 *  &lt;parameter&gt;&lt;name&gt;mail.smtp.dsn.notify&lt;/name&gt;
 *     &lt;value&gt;FAILURE&lt;/value&gt;
 *   &lt;/parameter&gt;
 *   &lt;parameter&gt;&lt;name&gt;mail.smtp.dsn.ret&lt;/name&gt;
 *     &lt;value&gt;FULL&lt;/value&gt;
 *   &lt;/parameter&gt;
 * &lt;/ResourceParams&gt;
 * </pre>
 * 
 * @author Glenn Nielsen Rich Catlett
 */

public class SendMailFactory implements ObjectFactory {
	// The class name for the javamail MimeMessageDataSource
	protected final String DataSourceClassName = "javax.mail.internet.MimePartDataSource";

	public Object getObjectInstance(Object RefObj, Name Nm, Context Ctx,
			Hashtable Env) throws Exception {
		final Reference Ref = (Reference) RefObj;

		// Creation of the DataSource is wrapped inside a doPrivileged
		// so that javamail can read its default properties without
		// throwing Security Exceptions
		if (Ref.getClassName().equals(DataSourceClassName)) {
			return AccessController.doPrivileged(new PrivilegedAction() {
				public Object run() {
					// set up the smtp session that will send the message
					Properties props = new Properties();
					// enumeration of all refaddr
					Enumeration list = Ref.getAll();
					// current refaddr to be set
					RefAddr refaddr;
					// set transport to smtp
					props.put("mail.transport.protocol", "smtp");

					while (list.hasMoreElements()) {
						refaddr = (RefAddr) list.nextElement();

						// set property
						props.put(refaddr.getType(), (String) refaddr
								.getContent());
					}
					MimeMessage message = new MimeMessage(Session
							.getInstance(props));
					try {
						String from = (String) Ref.get("mail.from")
								.getContent();
						message.setFrom(new InternetAddress(from));
						message.setSubject("");
					} catch (Exception e) {
					}
					MimePartDataSource mds = new MimePartDataSource(
							(MimePart) message);
					return mds;
				}
			});
		} else { // We can't create an instance of the DataSource
			return null;
		}
	}
}
